The royal teamed the long-sleeved gown with a silver bracelet and black clutch bag.

Director Spielberg told BBC Breakfast that Kate appeared to be moved while watching the movie, which revolves around a farm boy whose beloved horse is sold off to the Army.

He said: ‘I was sitting next to her and all I know is at one point my wife, who was sitting to my right, right in front of my face she passed a Kleenex … I saw the Kleenex go across my face, arrive and stop but I didn’t want tointrude on her experience watching War Horse so I never glanced over.’